#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main1()
{
	char s[] = "\\123456\123456\t";
	printf("%d\n", strlen(s));
	return 0;
}

int main()
{
    int a;
    int start = 0;
    while (scanf("%d", &a) != EOF)
    {
        start = a * a - a + 1;
        int i = 0;
        printf("%d", start);
        for (i = 1; i < a; i++)
        {
            start += 2;
            printf("+%d", start);
        }
    }
    return 0;
}